Jiri Peinlich
Blockchain Protocol Engineer at ConsenSys
England, United Kingdom
Summary
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Rockstar🎓
Top SchoolJiri Peinlich is a Blockchain Protocol Engineer with 12 years of software engineering experience, currently at ConsenSys in England. He has a strong Java and systems background from leadership roles as a Java Team Lead and earlier hands-on work in C/C++ and full-stack Java/JS environments across finance and gaming. Jiri contributed to the enterprise-grade Hyperledger Besu Ethereum client, improving sync performance, TLS support, and robustness—work that reflects deep expertise in distributed ledger clients and core protocol behavior. His applied mathematics master’s background underpins a methodical approach to performance optimization and data consistency in complex distributed systems. Known for moving between hands-on coding and team leadership, he combines low-level systems insight with practical delivery at scale. An interesting detail: he optimized world-state download ordering (persisting children before parents), a subtle change with outsized impact on fast sync reliability.
12 years of coding experience
11 years of employment as a software developer
GMKMaster, Applied Math, Master, Applied Math at Charles University
Stackoverflow
759reputation
36kreached
0answers
6questions
Github Skills (15)
javas10
ethereum10
back-end-development10
blockchain10
java10
cryptography9
performance-optimization9
testing8
git7
emberjs6
ember-data6
hibernate6
java-native-interface6
junit6
intellij-idea6
Programming languages (5)
Github contributions (5)
besu-eth/besu
Nov 2021 - Jan 2023
An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://github.com/besu-eth/besu/wiki
Role in this project:
Back-end Developer
Back-end DeveloperContributions:94 reviews, 29 commits, 63 PRs in 1 year 2 months
Contributions summary:Jiri contributed significantly to the Besu project, an enterprise-grade Ethereum client. Their work included refactoring the fast sync process by optimizing the download of world state data, ensuring children nodes were persisted before parents. They also added support for TLS configuration and the NO_COLOR environment variable, and improved the backward sync process. These commits demonstrate a focus on improving performance and functionality within the core blockchain client logic.
ethereumjavabesublockchainp2p
gezero/sicBo
Jul 2014 - Jul 2014
Contributions:50 commits in 4 days
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